Everycaller.com lists this number from Caller: Todd Heweett in North Carolina; it's a cell phone, with cryptic messages referencing WhatsApp. Looks like a troll/scammer/marketer
When I clicked on the receive button an automated voice started telling me about some code I must use. Not idea what for and probably nothing I subscribed for.
Who are these people?
Its a verification from whatsapp ..maybe some friend tried to invite you or someone was trying to use your Phone number to set their account up.."You can send a WhatsApp invitation via our Tell a Friend / Invite feature. This allows you to send an SMS or email with a download link" When it can't verify the number by SMS they call with a activation number to enter to you cellphone for the app...I know because I went through it last night..uninstalled ! On a side note though I've been getting alot of emails lately telling me I have messages on whatsapp..so I think its scammers